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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddc848ecb7e8e92423542a3f72e1cca5fba56204008b94ee7b0771469ce0002' 
  AND token = 't5qjDLfoSCbXN9htSo2cAWuv/G/bFA2D/k/ixPbmbgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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