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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf6eed5521ce10561afa820f746e3639f12cdec7faa8e7d9b349f1906eb0322' 
  AND token = 'Ggj7ijvJbALV8dhHnftDy2XudJjU4nHi1IG/h8YPFn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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