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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7432692f353d32218558d7bf804a3c5f727167eda4518df85be3c1269be2167c' 
  AND token = 'w9h+CuupfdwQc613yD+cobVYAFBRELNky0uv2Ms+jOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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