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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe4bbacb36bde20f0352d2ff807b8b13a5a8ee4f206069bde4f8bcd0d8633dd' 
  AND token = 'C2ndbY8RJNt8nApP2XNrfGXB2iZug+bP/Y/wmQ/DJN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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