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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3ba043d2cec3547a3daf911cd1340779fe4c1853fe1218171051c855b44b88' 
  AND token = 'eVy4xDUY1Q9Zw4zwsvQLTcyYkC0hKdLb3FzJA1/odFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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