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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6229036baa8a1fd6af02b6ed58e95a4c99cce2b4c621519ed78212299e87dcb' 
  AND token = 'O7ghQJoEtLJG/166AA/riT48VLB9/Ik3g+9zHQmqOlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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