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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7a531f653cb70ccd35b01ad360ac684fd2c1854d4236d868945f3bbbc500d8' 
  AND token = 'MWKjormAfnEK98wf7qG8HDWc8ZzQzGbuP6K1OXwKkYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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