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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56453e01613976b9f033b44dde5903163ba4475675baa7275545b32887d62ba6' 
  AND token = 'ohD04AqcMUwbYLwylhjKVW2M0YguuRPOy5nt+sa8bg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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