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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e205cdd90488b558c9d207b6cca873342572ebb3c4ab8f64c3fed94c2c81a1e2' 
  AND token = 'F55coeCJzR2z3a/0QJ/2OODHizxXUjFGPherwgGmHvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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