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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e88331dd0e8c6e1d7564a5c6db6ada3304e4e8ae1833cad93f83c467801f5e' 
  AND token = '6+VrBLkwtTkhg+vOjeAIBrc8PJm0fVDdsy3bOrMtR3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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