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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da75ed3a770163088538c19cfeb7c37910b874128dac9a2910d3cf84800cab7' 
  AND token = 'IsqMpJgsB+sQdGSprmFTxwHPxlJS+ilqqQ8l0wY/O4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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