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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2f175a602cd7fe88982088801288dad73764eb55f085ddd36d1ba460555c49' 
  AND token = 'kcSuSjYzfMcqz7kJ1V5ZtQ/CJXM8zu6U400Ta+ct+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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