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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4de5e3a0fd6d8fb2409abbb23b00cc0a530a0ef22bb9938c81cf98a0eeb07f1' 
  AND token = 'qPzcxyWk6TNtShQQEyUtP2iT2ZxP4vleMslnAN1dTWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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