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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e603f24f6bef87b4e4d90e6811f0691ffc24575e50807d5b092782bcd0612bb7' 
  AND token = '2wmCa+n3Qic7mDQVMAKY/mxA9NTrPraodJATTRsCs+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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