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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddafd6f5de263a6b38053088ee0727046a5a0b0e48d5fa5a454fe8a6e5b82a08' 
  AND token = '9ShgMSDESe8oDc+hARqyQylVQVmUouDCWcma+ruuGBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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