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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa125d75ce982d741f0300f814f48dc9b397ba8080442324c661df3e0b1c712' 
  AND token = 'On/r8Alz//d/uePtx+4WGyKrwxjP51ObTb6cCTmR2PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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