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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed888ce5927632202e71691f3a6103cbfe11303651d1d23a6e36950661eded0' 
  AND token = 'BhA9W7zfCxQC2805RnE1ukK+c35/pezvgj//FjmjXqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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