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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8762bb653dcb1fb74b7faf2059db5bb41684bd862464a0db85f8f6299b5874f' 
  AND token = 'EzhU77/51QKmadDnh7Pc3nA/fPHBa1dTyqHFjP3Rbqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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