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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5ff86639fba9ba4ceab43c0bf407bf123e3548ff035898c6d8fbf1ccb40b74' 
  AND token = 'FaB0Q8L6Q3ci5PWEn1v0oJvXNNfgfWxSim5doWkrFL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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