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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb63bdc88d26299bc60781e83bb20114e4c6ab5d85b18efeada94e45e5f8f2a5' 
  AND token = 'UzMu8dmiwFQa1xll2r+it5i7sEnplJwJyZA2cvccSMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}