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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76732ba1256ddc1a8c7b1e773b9eb64be63316a1295afb372ee7db15b4d6324' 
  AND token = '2fQnkSgw+IwQ9CffvYXxDMf2L2X0SqYNoghTILWNAL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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