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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb37fbf5435a836ba04fa81d519efa157ac479970fd28ea95a715f91d267a0b' 
  AND token = 'bOqRLD83ZsD+iuAT9K2VBjzzeu6abzJi2YsPMT5O1L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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