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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2a7d053b2507412a3b5d9ac3b73b2ee1b0b949c2e35066fabbaaa3d260f4f3' 
  AND token = 'SOQ+zUYr0mSJs5Z8fMEtY6Kp1D9lf0eCOo/CgNBc5vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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