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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731786941e4246b8b1226c5134ee3d6a0ac51ba7a70a63e75a3b20e653409909' 
  AND token = 'EQB+pLtU9ZpSzgamrSD+t5YuytFOqPpdiZQiqne95/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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