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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2282aa45914ca8e1185df1003c404db2c8355cca2f079793b1c8dbc1b99a67' 
  AND token = 'gNql336oiJdLV/UF8t8fNcZPPP1r3f/fGyw0wtjJQG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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