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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a82e64f43d6674bafb2548f466e2e3a9068057bd68ef2612e9c3f0cedcc4e9' 
  AND token = 'tHYD6th/rvj+nd257A/rjk0h6EkBZx1axWc0j0n5wz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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