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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57eb03720cacef1b3fcf089b538ef42533c44478ef80985d3fe7b423c2a0c83' 
  AND token = '/6nnfNvVayP9nM/AQ2bEyA8kiKaFpwBQjvHey/P2S7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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