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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a091f6907474867fd602e4e7bc9ec0173a9d3f6d42077bab3aec67b10354eb45' 
  AND token = 'g/i3yoIqwlCa/Rn/D3gOlrng0vbaR9MIcXvA3czFtLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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