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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2d70509fed7fadbe537b10b6e97a08d4274aebce9f2e2516e8ed45daf52ff5' 
  AND token = 'O5IRrTvDYsiT0bbnENJor8+wjyxg43ovdP7pQvU2LTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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