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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb3866fc32d0f45de292310fe6f83f25878d13bd2abd490ab280e144fdba961' 
  AND token = 'BcD/3XdenaEjBx15EmD5zTwE2EAZLYn36w9BM4ybPFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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