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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba147bff1328fdcb20ab6ef72db6f88819b1c10bb457cfc750e6f4c990e33d0' 
  AND token = 'mG+KxAxfFMLHjQGuIIRgiNugt4fiAHxug9t3xdUPnC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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