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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f468e8e8cd8d20ac99418082f9e97884bdf898739027d769b630db118abf7d' 
  AND token = 'mHUPc/7j9c8LHSTgcJRGKaCVj/RtL3mt3dEGvmW7VBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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