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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad620f7998f024f5cdcfe3fb374dba5e6595a624ddeea4eff0f902f560009f1a' 
  AND token = 'rwN12t+xV0C4oTreKovP4NcYR4NLEGatAPiBfEbRa5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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