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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b4a0ed779eded247a48aa738f244ebfdfb338744c5ddf9b0c9cd7f4cf6cc2a' 
  AND token = 'DHCC+rXQAmsrNK2Z3tCJn2T8qDT77je4rVWwOdL4i+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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