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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8d5190ea78432c47387c80c2ef0df2bbc29794a2d9c2b5b02cab3bd9c9dcf3' 
  AND token = 'QSfQrAtI9rlB4YV6vwo7wJrqeTrJuRG+nGhm6OhN2SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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