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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc952fc17aa1b92b1421a554cdcb53c4d887d44b173d423466cd0b066809b3b' 
  AND token = 'I3frka9l0TqNXnuvt5wPGY2DXGFXPe058sntECdf2Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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