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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c0ac1aa6d8c15ee8a81dc9f5460d2dc0f51366d5520114e4e237561d9c3c9a' 
  AND token = 'LHLOe/gv9iAHTdbJLLpFk+oujt55SfrntYffNfXk+dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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