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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425207e09d195b1f5f2ec015fe5e3e898195e1d0083d19101939f900d26ed013' 
  AND token = 'jTRK0nUCM2cgRNdlAxWSvs6VVwWvy9WwTfluwUG71hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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