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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f202173e1b3d3bc936aa61000c1c7320cc11dcc1026137945dc6c957bc0234c2' 
  AND token = 'HGDkL6mNx9uAFkYDDnLpjr7uijUP7ijJ55qQb8F5FHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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