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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bd4d78a747b0e813b68951e750cfae72235a1a51e4361e87122376694fc159' 
  AND token = 'W7V4xPZ/eVZty82pdjM4LHtmgtG5+jENxoiUr8uZdhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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