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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c001e8ef626abcf32ccb43a56dcbff6d4f56274c188fcb02f7897d3d63eb6f1d' 
  AND token = 'Pha1bjxvpwlZ3d3c2/76phI0xp1FifrkNDzl/J3j1Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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