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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72baf980b4d162f29b8340d54f996b7781d4e6e203ab7d201b0c88a692703d7' 
  AND token = '17kXe/F+kqEsegoBY3e3diB5XTX63NdR5qg1nCD8ITc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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