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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1132071650c2d18dc98b45d1d3a558b1f2b94eda310a0b3b34b38064ee9fa739' 
  AND token = 'T7ZnUwl6v0Jhz0vbVp89SMArOG/O+2zMWQPy22TCOCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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