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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db62f6d3b5f3a3a621bd2971d06d2e15197d302c3d70590b9bb91826615041fe' 
  AND token = 'Cjjb1BFCyWnk3KuJ9wXlXEngKK7zCVBMrvFR9HFixBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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