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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab4ebe0802c0b7016ba98f72ee31ed95632dbac982c91be6269dd2b90c92d59' 
  AND token = 'VbPoupRgYcbK7vjqxb3HE/3IvpD+AbWEVLEyZL/DCmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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