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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592529657d8eabef6ac718604c107729e5c7e46db3e9b92fc5cb47860bdc6471' 
  AND token = 'tANSHRQgCLplKrcH6KYj+Q3Q5wMc39SF5JNEXCu2MRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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