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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda803fc5f7ff4faa5897dba86b525ab0be652e8167012865b176a0476d4f092' 
  AND token = 'KNn63INs4PUBqboa9Q2bthcxWYH/i7SfyhAR9F33rU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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