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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6964f15f6541a5290ba1f32a6a1a31fb96e579eb63a74e3ed041781006b3d416' 
  AND token = 'CPsRjkZJgqwINbe8MPm2HTCgwUQkKWKTDKxxOxuRjxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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