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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9414b87c55b325bd3962f1d54e53a5a333014511466df2a38b8102e31b11a90' 
  AND token = 'wgUnOGxlSCd1HWeJYPOwi2x8Ls56DOzTPeGPh1ilMAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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