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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079eb44d137663a49299adf4136dbff2c0be5f188928ab17316c5054eedfc932' 
  AND token = 'Atro30k5L6uVAGhjRnDd916XvUYhO26ot9MWmBLDU0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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