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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd743ccb1f612bdf38c2514e28a968a2ea05930badae00dcb0be55544657a40ac' 
  AND token = 'cGo7LuPsboE4Y40TSXKTCNCzEqgg3HXnTmF7/ktfcwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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