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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b809c0bbc1adf177151084a1d6a64963ae79b265a22ad57800a1915fead53206' 
  AND token = 'DMpES8aO3BbqqRw6tpjStpLsQwZ60B3o9BwM8LceeU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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