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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af987ea92e56926c1b6156dbb8661fd26179847cebad854d1b37fba7731ef9d' 
  AND token = 'MRdjh5TKwa+wKWUSQAUWpAVReW2TT4co0fleDUJ4JxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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